//
// Created by evenvi on 18-7-18.
//
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/sendfile.h>

int main(int argc, char* argv[])
{
    if(argc != 2)
    {
        printf("useage : %s <file>\n", argv[0]);
        return 1;
    }

    int filefd = open(argv[1], O_CREAT | O_WRONLY | O_TRUNC, 0666);
    assert( filefd > 0);

    int pipefd_stdout[2];
    int ret = pipe(pipefd_stdout);
    assert(ret != -1);

    int pipefd_file[2];
    ret = pipe(pipefd_file);
    assert(ret != -1);

    ret = splice(STDIN_FILENO, NULL, pipefd_stdout[1], NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE);
    assert( ret != -1);

    ret = splice(pipefd_stdout[0], NULL, pipefd_file[1], NULL, 32768, SPLICE_F_NONBLOCK );
    assert( ret != -1);

    ret = splice(pipefd_file[0], NULL, filefd, NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );
    assert( ret != -1);


    ret = splice(pipefd_stdout[0], NULL, STDOUT_FILENO, NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );
    assert( ret != -1);

    close(filefd);
    close(pipefd_file[0]);
    close(pipefd_file[1]);
    close(pipefd_stdout[0]);
    close(pipefd_stdout[1]);

    return 0;
}
